"Car is 6" longer than original, and this is well hidden."
Actually it's only 2" longer. The rear track is also 2" wider for more stability. I drove it and, while it was the first prototype, it only had a couple of details keeping it from feeling fully sorted. Very impressive.
The mid-engine layout did not make it feel at all cramped. In fact it was far roomier than my Speedster. While you do give up the "just throw it in the back" feature, having a sizable sealed trunk to keep things out of sight is a plus. I was surprised at the room in both trunks. The car was also amazingly quiet, given the proximity of the engine. It's taken them a couple of years longer than expected, but the time was well spent.